<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            color: red;
        }
        h1{
            color: rosybrown;
        }

        .success{
            height: 10px;
            border-style: solid;
            border-width: 1px;
            color: royalblue;
        }

        #div1{
            height: 10px;
            border-style: solid;
            border-width: 1px;
            background-color: seagreen;
        }
        .mb20{
            margin-bottom: 20px;
        }
    </style>
</head>
<body>
    <h1>h1</h1>
    <span>span</span>
    <div class="success mb20"></div>
    <div id="div1"></div>
</body>
</html>